2588-0934 2588-0934 S2588-09342018000200065 10.37785/nw.v2n2.a4 Ecuador 00 12 2018 00 12 2018 2 2 65 88

2007 1990 1980 1986 1993 1985 2017 1 3 3 11-23 2007 1974 1974 2 2002 Septima 2003 1978 2009 1 1985 2011 1979 13-14. 2009